Definitions for "VITS"
Vertical-interval Test Signal (US); Vision Insertion Test Signal (Europe). See ITs.
Test signals inserted in the lines of the vertical blanking interval, defined by the TV standard, e. g. for the 625 standard the CCIR together with the EBU issued the formal specifications for the signals inserted in lines 17, 18, 330 and 331.
Video insertion test signals. Specially shaped electronic signals inserted in the invisible lines (in the case of PAL, lines 17, 18, 330 and 331) that determine the quality of reception.